In order to save space I added my bookmarks toolbar to the right of the menu bar. Originally there was about 1/2 inch space between "help" and the vertical bar. I went into customize mode and it showed up as a rectangle. I dragged it down to remove it. As you can see there is no 1/2 inch space now. I just wondered how to put the space back if I wanted to?

Try running in Firefox "Safe Mode".> http://kb.mozillazine.org/Safe_Modeor... Help > Re-start with Addons disabled or hold down your Shift key as you click the Firefox short cut..Do not check any boxes.This is a fault finding mode.NB: Be careful of the "Delete all bookmarks except for back-ups" option.

Don't add any extensions or themes until it's working O.K.If Firefox is O.K. in Safe Mode then it's possibly an extension/theme...etc causing it.Run Firefox in normal mode & disable them all. Re-start Firefox.Enable each in turn, or by ½'s, re-starting Firefox each time, till the faulty extension is found.Either update or un-install it.

When in Safe Mode... * The status of plug-ins is not affected. * Custom preferences are not affected. * All extensions are disabled. * The default theme is used, without a persona. * userChrome.css and userContent.css are ignored. * The JIT/Javascript compiler is disabled. * The default toolbar layout is used. * Hardware acceleration is disabled.